investigators hinted that police agents were being helped by high-tech equipment supplied by the pentagon. the standoff began late tuesday when the suspect, jimmy lee dykes boarded a school bus fatally shooting the bus driver. he then randomly grabbed the child and took him to an underground bunker. negotiators spent days talk to go dykes through a ventilation pipe. >>> on his first trip in his second term president obama hit the road to push for stricter gun laws. nbc bay area's janelle wang is here with that story and more in our "world tonight." >>> raj, president obama chose minneapolis because the city has recently brought its crime rate to a 30-year low. the president is pushing congress to pass universal background checks, a limit on high-capacity magazines and an assault weapons ban. in his speech today the president said law enforcement should never be outgunned on the streets. universal background streets is gaining support but the ban on assault weapons is a tougher fight. >> there's even one thing we can do. if there's just one life we can save, we've got an obligation to try.